Raj Sandhu, 55, was caught on CCTV footage battling the thugs at Maypole Stores in Welford-on-Avon, Warwickshire, on Monday night.
Despite suffering bruises in his arm, he was successful in forcing the robbers to flee with just some cash they could grab on the way out.
"It was gut instinct. I thought if I didn't fight back, they would hit me over the head with it (the hammer)," Sandhu told Coventry Telegraph.
"I was trying to get behind the counter as that is where the panic button is, but the vibrations (of what happened) set it off anyway," he said.
When they were unable to open that, they turned on the shopkeeper who used the cardboard boxes around him to defend himself.
Some of the cash from one of the boxes Sandhu was filling up spilled out onto the shopfloor as the robbers took aim at him with a hammer.
The robbers have been caught on the CCTV picking up some cash off the floor and fleeing outside to get away in a dark coloured Mercedes.
"It's shocking but he was really brave. I'm really proud of him for being so strong during this difficult time," his daughter-in-law Bobbi said.
Warwickshire Police is appealing for witnesses to come forward who may have seen "anything suspicious".
"Fortunately, the victim only suffered minor injuries but he has been left feeling shaken. The shop is on the main road through Welford so someone passing by may have seen the incident or seen the men coming or going from the store," said Detective Sergeant Richard Simpkins.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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